2 This file is part of GNUnet.
3 (C) 2010 Christian Grothoff (and other contributing authors)
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22 * @file include/gnunet_block_lib.h
23 * @brief library for data block manipulation
24 * @author Christian Grothoff
26 #ifndef GNUNET_BLOCK_LIB_H
27 #define GNUNET_BLOCK_LIB_H
29 #include "gnunet_util_lib.h"
33 #if 0 /* keep Emacsens' auto-indent happy */
40 * Blocks in the datastore and the datacache must have a unique type.
42 enum GNUNET_BLOCK_Type
45 * Any type of block, used as a wildcard when searching. Should
46 * never be attached to a specific block.
48 GNUNET_BLOCK_TYPE_ANY = 0,
51 * Data block (leaf) in the CHK tree.
53 GNUNET_BLOCK_TYPE_FS_DBLOCK = 1,
56 * Inner block in the CHK tree.
58 GNUNET_BLOCK_TYPE_FS_IBLOCK = 2,
61 * Type of a block representing a keyword search result.
63 GNUNET_BLOCK_TYPE_FS_KBLOCK = 3,
66 * Type of a block that is used to advertise content in a namespace.
68 GNUNET_BLOCK_TYPE_FS_SBLOCK = 4,
71 * Type of a block representing a block to be encoded on demand from disk.
72 * Should never appear on the network directly.
74 GNUNET_BLOCK_TYPE_FS_ONDEMAND = 5,
77 * Type of a block that is used to advertise a namespace.
79 GNUNET_BLOCK_TYPE_FS_NBLOCK = 6,
82 * Type of a block that contains a HELLO for a peer (for
83 * DHT find-peer operations).
85 GNUNET_BLOCK_TYPE_DHT_HELLO = 7,
90 GNUNET_BLOCK_TYPE_TEST = 8
96 * Possible ways for how a block may relate to a query.
98 enum GNUNET_BLOCK_EvaluationResult
101 * Valid result, and there may be more.
103 GNUNET_BLOCK_EVALUATION_OK_MORE = 0,
106 * Last possible valid result.
108 GNUNET_BLOCK_EVALUATION_OK_LAST = 1,
111 * Valid result, but suppressed because it is a duplicate.
113 GNUNET_BLOCK_EVALUATION_OK_DUPLICATE = 2,
116 * Block does not match query (invalid result)
118 GNUNET_BLOCK_EVALUATION_RESULT_INVALID = 3,
121 * Query is valid, no reply given.
123 GNUNET_BLOCK_EVALUATION_REQUEST_VALID = 4,
126 * Query format does not match block type (invalid query). For
127 * example, xquery not given or xquery_size not appropriate for
130 GNUNET_BLOCK_EVALUATION_REQUEST_INVALID = 5,
133 * Specified block type not supported by this plugin.
135 GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED = 6
140 * Handle to an initialized block library.
142 struct GNUNET_BLOCK_Context;
146 * Mingle hash with the mingle_number to produce different bits.
148 * @param in original hash code
149 * @param mingle_number number for hash permutation
150 * @param hc where to store the result.
153 GNUNET_BLOCK_mingle_hash (const GNUNET_HashCode * in,
154 int32_t mingle_number,
155 GNUNET_HashCode * hc);
159 * Create a block context. Loads the block plugins.
161 * @param cfg configuration to use
162 * @return NULL on error
164 struct GNUNET_BLOCK_Context *
165 GNUNET_BLOCK_context_create (const struct GNUNET_CONFIGURATION_Handle *cfg);
169 * Destroy the block context.
171 * @param ctx context to destroy
174 GNUNET_BLOCK_context_destroy (struct GNUNET_BLOCK_Context *ctx);
178 * Function called to validate a reply or a request. For
179 * request evaluation, simply pass "NULL" for the reply_block.
180 * Note that it is assumed that the reply has already been
181 * matched to the key (and signatures checked) as it would
182 * be done with the "get_key" function.
184 * @param ctx block contxt
185 * @param type block type
186 * @param query original query (hash)
187 * @param bf pointer to bloom filter associated with query; possibly updated (!)
188 * @param bf_mutator mutation value for bf
189 * @param xquery extrended query data (can be NULL, depending on type)
190 * @param xquery_size number of bytes in xquery
191 * @param reply_block response to validate
192 * @param reply_block_size number of bytes in reply block
193 * @return characterization of result
195 enum GNUNET_BLOCK_EvaluationResult
196 GNUNET_BLOCK_evaluate (struct GNUNET_BLOCK_Context *ctx,
197 enum GNUNET_BLOCK_Type type,
198 const GNUNET_HashCode *query,
199 struct GNUNET_CONTAINER_BloomFilter **bf,
203 const void *reply_block,
204 size_t reply_block_size);
208 * Function called to obtain the key for a block.
210 * @param ctx block context
211 * @param type block type
212 * @param block block to get the key for
213 * @param block_size number of bytes in block
214 * @param key set to the key (query) for the given block
215 * @return GNUNET_OK on success, GNUNET_SYSERR if type not supported
216 * (or if extracting a key from a block of this type does not work)
219 GNUNET_BLOCK_get_key (struct GNUNET_BLOCK_Context *ctx,
220 enum GNUNET_BLOCK_Type type,
223 GNUNET_HashCode *key);
226 #if 0 /* keep Emacsens' auto-indent happy */
234 /* ifndef GNUNET_BLOCK_LIB_H */
236 /* end of gnunet_block_lib.h */